Arizen Bio Labs

Arizen Bio Labs is a US-based research-peptide supplier whose strongest signal is its lab work: public, batch-linked Janoshik COAs on exactly the compounds buyers most need verified. We pulled and confirmed two genuine certificates from real samples — Retatrutide at 99.909% (lot JRT120225) and BPC-157 at 99.5% (lot J0-2601-004), each recent and with dual-vial quantification. Janoshik is a gold-standard, independently-verifiable lab, so where Arizen publishes a COA the evidence is about as good as it gets.

The remaining limitation is breadth, not quality. Only around 10 of 35 products carry a published certificate — the two GLP codenames and BPC-157 do, but Semaglutide, TB-500, Ipamorelin, CJC-1295, Cagrilintide and SS-31 don't (the FAQ is candid that coverage isn't universal), and all of the published testing comes from one lab. In July 2026, PeptidePrices spoke directly with ownership and came away with materially greater confidence in the operator, company practices, responsiveness, and transparency. The public review history is still young, but the direct diligence plus the verified Janoshik evidence supports the higher score. Card + Zelle checkout, US overnight shipping, 10%-off reader code PEPTIDEP10.